gpio: da8xx_gpio: Add "ti,keystone-gpio" compatible

Add "ti,keystone-gpio" compatible so as be able to use Linux DT files as
is.

Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
diff --git a/drivers/gpio/da8xx_gpio.c b/drivers/gpio/da8xx_gpio.c
index d28e1fa..ac88f0c 100644
--- a/drivers/gpio/da8xx_gpio.c
+++ b/drivers/gpio/da8xx_gpio.c
@@ -535,6 +535,7 @@
 static const struct udevice_id davinci_gpio_ids[] = {
 	{ .compatible = "ti,dm6441-gpio" },
 	{ .compatible = "ti,k2g-gpio" },
+	{ .compatible = "ti,keystone-gpio" },
 	{ }
 };